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Finding the Fourth Proportional to 403.20, 554.88 and 389.12

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Solution

The fourth proportional to 403.20, 554.88 and 389.12 is: 535.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.20 : 554.88 = 389.12 : x
  2. Step 2: Convert to fraction form
    403.20/554.88 = 389.12/x
  3. Step 3: Cross multiply
    403.20x = 554.88 × 389.12
  4. Step 4: Simplify right side
    403.20x = 215,914.91
  5. Step 5: Solve for x
    x = 215,914.91/403.20
  6. Step 6: Final answer
    x = 535.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.